What is inertia

The speed and direction of an object in motion

The force that acts on an object at rest

An objects resistance to change its motion

The motion of an object

1 answer

Inertia is defined as an object's resistance to change its motion. It is a property of matter that causes it to remain at rest or to continue moving in a straight line at a constant speed unless acted upon by an external force. This concept is foundational to Newton's first law of motion.